Two trains cross each other at speed 57 kmph and 87 kmph. If both the trains move in the same direction, find the combined length of the trains. The time taken by the train to cross each other is 85 seconds.

Problems on Trains topics include: Trains and stations, two trains passing each other, and trains crossing poles. Types of  train-based questions that are asked: 1. Time Taken by Train to Traverse Any Stationary Body or Platform 2. Time it takes for two trains to cross paths 3. Train Equation-Based Problems Useful Formulas For Problems on Train - Speed of the Train = Total distance covered by the train / Time taken - The time it takes for two trains to cross each other is equal to (a+b) / (x+y) if the lengths of the trains, say a and b, are known and they are going at speeds of x and... Show more

Problems on Trains topics include: Trains and stations, two trains passing each other, and trains crossing poles.

Types of  train-based questions that are asked:

1. Time Taken by Train to Traverse Any Stationary Body or Platform
2. Time it takes for two trains to cross paths
3. Train Equation-Based Problems

Useful Formulas For Problems on Train
- Speed of the Train = Total distance covered by the train / Time taken
- The time it takes for two trains to cross each other is equal to (a+b) / (x+y) if the lengths of the trains, say a and b, are known and they are going at speeds of x and y, respectively.
- When the length of two trains, let’s say a and b, is known and they are travelling at speeds of x and y, respectively, in the same direction, the time it takes for them to cross each other is equal to (a+b) / (x-y).
- When two trains begin travelling in the same direction from points x and y and cross each other after travelling in opposite directions for times t1 and t2, respectively, the ratio of the speeds of the two trains is equal to t2:t1.
- If two trains depart from stations x and y at times t1 and t2, respectively, and they go at speeds L and M, respectively, then the distance from x at which they will collide is equal to (t2 – t1) (speed product) / (difference in speed).
- When a train stops, it travels the same distance at an average speed of y rather than the normal average speed of x. Hourly Rest Time = (Difference in Average Speed) / (Speed without stoppage)
- If it takes two trains of similar length and speed t1 and t2 to pass a pole, the time it takes for them to cross each other if the trains are going in the opposite direction is equal to (2t1t2) / (t2+t1).
- If it takes two trains of equal length and speed t1 and t2 to cross a pole, the time it takes for the trains to cross each other if they are travelling in the same direction is equal to (2t1t2).

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